How To Install Filler Strips Between Ikea Cabinets. The filler strips can be nailed or screwed from the inside of the cupboard sides or screwed on from the outside. If the wall is even measure between the wall and the cabinet and mark this distance at the top and bottom of the filler piece.
Measure the width both at the top and bottom of your cabinet and measure the height of your cabinet as well. Be sure to tape this area that you are about to cut. Simply attach the filler panel you will use the supporting lumber and screw through the existing cabinet shelf pin holes.
For every side panel we used four screws two in the top corners and two in the bottom corner.
Find panels to match your cabinets and kitchen at great prices. You can secure the scribe piece with either staples or screws. Good luck on whatever you do that works for you. You can use the same method to attach a gap filler on the underside of the side gaps.